.video {
    width: 100%;
    height: 100%;
    display: inline-block;
}
.btnBox {
    width: 100%;
    height: 20px;
    text-align: center;
    position: absolute;
    bottom: 20px;
    >span {
        display: inline-block;
        width: 20px;
        height: 20px;
        line-height: 20px;
        text-align: center;
        background: #fff;
        border-radius: 10px;
        margin: 0 5px;
        cursor: pointer;
    }
     
    >span:hover, .btnActive {
        color: red;
        font-weight: 700;
    }
}